Electric switch



Feb. 28, JOHNSON ET AL ELECTRIC SWITCH Filed Aug. 19, 1931 Z7 Z0 Z8 JUG/ZiO/ J I/rZJT fa/201500, and

Carl 6. J0/2/2J0/ Patented Feb. 28, 1933 UNITED STATES PATENT OFFICE ELECTRIC SWITCH Application filed August 19, 1931. Serial No. 558,075.

Our present invention relates to improvements in manually controlled, electrically operated switches, and has for its object the construction of an improved form of such switch, same being more adaptable to present day needs, due to its simplicity, ease of operation, and the shortened time required to operate.

Another object of our invention is to eliminate the use of relay, thus doing away with the added complication of additional wiring, and the additional source of current supply for the relay magnets.

A further feature of our invention is simplicity, enabling manufacture at a low cost, reliability in operation, and adaptability to being placed and operated in any desired position.

Our invention comprises a series magnet, operated by electrical contact, actuating a tappet; the latter being mechanically latched closed and manually released.

-We attain the foregoing objects by means of the structure shown in the accompanying drawing, which illustrates a fragmental elevation of the switch mounted'upon its base.

The front or cover being removed for purposes of clearness.

The reference character 1, designates the base or mounting for our switch, and shows our device connected to antelectrical circuit by means of conductors 2 and 3; the load on this circuit is designated as 4. Binding posts 5 and 6 are connected to each conductor respectively. From the binding post 5 extends a conductor 7 to one end of the winding of a magnet 8, the other end is connected by conductor 9 to a yielding terminal or contact point 10. A like contact 11 is connected b means of conductor 12 to binding post 6. g momentary contact switch 13 manually controls the branch circuit so formed.

Pivoted at 14 is a tappet 15 normally held open as shown against the pin 16 by means of the spring 17. The free end of the tappet 15 rests upon a lever 18, pivoted at 19, normally held under tension against the stop 20 by means of the spring 28. In line with the and catch 21 pivoted at 22 and held in frictional contact therewith by means of the spring 23. The opposite end of the lever 18 terminates in a contact point 21. In line with the movement of this contact point 24 is a yielding contact 25 from which extends a conductor 26 to the conductor 7 before described. From the lever 18 through the spring 28, the primary circuit is completed by the conductor 27 which connects the spring 28 to the conductor 12.

Operation.lVhen the operator wishes to close the circuit, he pushes the switch 13 into momentary contact with the points 10 and 11, thus closing the branch circuit through the conductors 7, 9 and 12, energizing the magnet 8 which in turn actuates the tappet 15 closing the contacts 2 1 and 25 and completin the primary circuit. At the same time, the lever 18 is mechanically locked in this closed position by means of the toggle arm and catch 21.

' To open the primary circuit, operator pushes the button actuating the toggle and releasing the catch 21 which assumes the position indicated on the drawing.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

An electric circuit carrying the load in series, a master switch with yielding contact also in series with the load, an electric magnet for closing said master switch actuated across said switch, an auxiliary switch placed in the circuit connecting the magnet to the master switch, so that the closing of said master switch will short circuit the electromagnet, means for locking said master switch in its closed position, and mechanical means for releasing said lock and openin the master switch when locked in its close circuit position.

CARL G. JOHNSON. KURT T. JOHNSON.

movement of the end 01 the lever 18 adjacent I 50 the stop 20 swings a push button toggle arm 

